“Resins are complex substances that include oily compounds called terpenes. Over time, some terpenes evaporate while others condense and become cross-linked to each other, forming hard polymers.”
http://www.madehow.com/Volume-7/Amber.html
Organic shellac is a well known organic resin used to coat furniture and is non-toxic and environmentally friendly. It comes from the nests of Laccifer Lacca which can be found in Thailand and India. It is even used to coat apples (for gloss). This is a readily available substance however does not seem to be used as a setting material rather a surface layer.

Amber is also a naturally occurring resin however is the product of extinct species of trees. The trees are sappy, fall and are covered in a layer of sediment – fossilising for between 10 million and a 100 million years. It is of high value as used in the jewellery industry and because of it‘s rarity. It is of even great value because many insects have been fossilised within the resin being of incredible use to researchers. About 90% of amber is found in one region of Russia, it is the jewellery equivalent of fossil fuel so again not particularly helpful for this project.
Thermoset Resins
Thermoset Resins are primarily used in the automotive, construction and furniture industry. Around 350 000 tonnes a year is produced currently in the UK for the purpose of composite materials such as particle board or glass fibre panels. (www.azom.com)
Thermoset refers to a substance that when heated becomes a liquid and changes the chemical structure. This does not change back upon cooling hence when it sets it becomes a hard solid.
Most resins are particularly evil as are made from petrochemicals and involve many toxic and volatile parameters. However there are bio-resins being developed which are derived principally from vegetable oils such as rapeseed. This would erase the use of phenol and formaldehyde (both highly toxic chemicals) from manufacturing plants and the slow release of these compounds from product.
This is researched as part of biopolymer experimentation and renwable plant technology. ‘There is a clear place in the market right now for new, more environmentally friendly resins that are competitive in price and performance, and adaptable to existing processes for manufacturing composites,’ says project manager Dr Paul Fowler. ‘The growing interest reflects the demand for alternative, renewable sources of thermosetting resins that will begin to address the depletion of finite resources and reduce emissions.’ (www.azom.com)
This is also positive as the process reduces carbon emissions and as the growing of the rapeseed offsets carbon emissions thorugh absorbing carbon. For every tonne of bio-resin produced approximately 2.5 tonnes of carbon dioxide would be sequestered by the growing plants.
‘Our clean and green chemical processing technologies make it possible to produce bio-resins from renewable resources,’ says Dr Fowler. ‘We’ve succeeded in developing a low effluent manufacturing procedure that’s based on the use of vegetable oil, water, air and electricity and yields formaldehyde-free products with excellent performance characteristics.’ (www.azom.com)
The process uses a key technique called ozonisation which turns the vegetable oil into the thermosetting resin. This process is under patent at the moment however uses ozone gas at ambient temperature to make this transition. The substance can be delivered in aqueous or in an oil based system (http://www.cambridge-biopolymers.com/Bioresin.htm) in either acidic or alkaline conditions at any temperature between 0 – 200 degrees celcius.
Performance matches that of inorganic resins in productive output thus can be used industry wide and should allow for a viable transition for many commercial manufacturers. The potential market for farmers growing rapeseed is tens of thousands of tonnes of oilseeds per year.
The bi-product of rapeseed meal can be used to generate electricity thus potential for onsight resin and energy creation could power the ozonisation process. Other oils are Cashew Nut and other tryglycerides such as Soya and Sunflower.
Biopolymers are gaining attention and enthusiasm as the search for alternatives to the high energy and toxic biproduct creating existing petrochemical resins. PLA, polylactic acid, is obtained from corn starch or sugar beet through a chemical process (http://www.biomatdev.com/details-info-produit-marche.aspx?id=75). A product of Natureworks LLC will be used for Nobel Juice packaging. Metabolix inc have announced a plant to create PHA (poluhyrdoxyalkanoate) which is grown in fermentation vats using sugar and microbes (http://goliath.ecnext.com/coms2/gi_0199-5609047/Bioresins-gaining-ground-over-skeptics.html#abstract).Further ReferencesSustainable Technologies Initiative DTI
REPLANT Project – the BioComposites Centre at the University of Wales, Bangor
NatureWorks LLCMetabolix INcPatents.com – ozonisation
On the other side of things naturally occurring resins have been used for ages by indigenous cultures. These are usually saps that are collected by aborigines. Dammar is an exudation primarily from the tree Shorea Robusta in India but dammar is also produced in Borneo, Java, Sumatra, Thailand and Vietnam. It can be found on or near trees and can be caused by they heartwood boorer making trees unhealthy. It occurs in 16-24cm brittle pieces of pale yellow colouring and can be harvested by tapping the trees. There are many traditional uses such as incense, medicine, disinfectant, fastening spearheads. It can be used for hardening soft wax for shoe polish, carbon paper, typewriter ribbons and paints and varnishes. Technical appropriations include paints, batik dyes, sealing wax , printing. Indonesia exports the most dammar, 2000 – 7000 tonnes ($US1.6 million) speicies of high quality are Shorea javanica, S. l amellata, S.virescens, S.retinodes, S. assamicassp glabifera. Some are naturally occurring forests others are agro forestry systems which are resinous tree plantations. ( A review of Dipterocarps: Taxonomy, Ecology and Silviculture by Simmathiri Appanah, http://books.google.com.au/books?id=EoEDLlXcdvYC&dq=tribal+resins&source=gbs_summary_s&cad=0).
Australian trees do produce dammar, anything of the genus Dammara better known as Kauri pine and is widely used for varnish purposes.
This research displays the way in which resins can be made through harvesting of nature and bioproduction. The creation of resin is through breaking down plants to separate the oil or ingrediient that can then be used in this process.
Unfortuneatly so far I have not found much info on how to do yourself however know it is possible so will keep searching. Otherwise will use naturally occurring resins I guess…